Stoker mechanism



April 26, 1938. E. A. TURNER STOKER MECHANISM Filed July 21, 1954INVENTOR.

Patented Apr. 26, 1938 uNiTED STATES PATENT OFFICE STOKER MECHANISM ofDelaware Application July 21,

3 Claims.

This invention relates to Stoker mechanism and more particularly to fueldistributors or other terminal parts of stokers.

The main object of the invention is the provision of improved means forcooling the fuel distributor plate of the Stoker exposed to the intenseheat of the fire of the boilerfurnace.

Another object of the invention is to employ the pressure fluid of thefuelpropelling blasts as ,lo a cooling medium for the fuel distributorplate of the stoker and to cause this fluid to pass through the fueldistributor plate before entering the pressure regulating valves for thepropelling blasts. A a A further object of the invention is theprovision of means in the pressure fluid supply system of the Stoker forfirst passing the pressure fluid for the propelling blasts into the fueldistri-butor plate of the Stoker and thence `to the pressure regulatingValves for the propelling blasts or for cutting out of operation theflow of fluid to the fuel distributor plate and passing the fluiddirectly to the aforesaid regulating valves. l

Other objects and advantages of `the invention will be apparent from thefollowing description taken in connection with the accompanying drawing,in which, i

Fig. l is a central vertical longitudinal sectional view through therear portion of a boiler furnace with the deviceof the inventionsimilarly shown;

Fig. 2 is a sectional View taken on the line 2-2 of Fig. 1; and

Fig. 3 is a plan view of the chambered fuel distributor of theinvention.

On the drawing, IU illustrates a boiler furnace having the upstandingwall II which embodies the firing opening IZ through the lower portionof which fuel is delivered to the furnace by the stoker I3 and abovewhich stoker fuel may be fed manually through the firing opening, theupper part of which is covered by the usual form of redoor I4. Only thatportion of the stoker I3 is shown which is necessary to illustrate the1934, Serial No. 736,316

posed to the flame o-f the fire or to the intense heat thereof. 'I'hisplate may carry the abutment ribs I 9 or other equivalent means forcooperating with the pressure fluid fuel propelling blasts dischargingfrom the rearwardly disposed jet or distributor head 20 to spread thefuel over the flrebed.

The distributor head 20 is mounted in the mouth portion I6 back of thedistributor plate il and is secured in this position by the cap screws2I. Jet openings 22 in the front face of the head 20 in a position todirect pressure fluid over the plate I'I communicate with a plurality ofseparated chambers 23. Each chamber is open at its bottom end to receiveone of the supply, pipes 24 leading from a manifold 25 disposed on thewall Il at one side of the stoker conduit. The chamber 26 of themanifold communicates with the supply pipes 24 and it receives pressurefluid from the pipe 21. A regulating valve such as an ordinary globe orneedle Valve 28 is placed in each supply line 24 between the manifoldand the distributor head to control the pressure of the fluid propellingblasts.

Thus far the construction described is well` known in the art,particularly as embodied inthe Standard BK Type Stoker. The novelty ofthe present invention is the provision with the construction describedor the like of means for employing the pressure fluid for the fuelpropelling blasts as a cooling medium for the distributor plate of theStoker in a manner not to interfere with the operation and control ofthe propelling blasts. This means now will be described.

Pressure fluid from a suitable source of Supply is conducted by the mainsupply line 30 through the globe valve 3I to the two-Way valve 32. Thesupply pipe 2T of the manifold opens into one side o-f the two-way valve32 and at the opposite side a supply line 33 leads from the aforesaidValve to the distributor plate ITwhere it opens into an enclosed chamberI'Ia formed at the under side of the plate constituting in effect achambered jacket. The chamber Ila is divided by the ribs I'Ib into aplurality of smaller charnbers I'Ic which communicate at opposite endsthrough the apertures as at I'ld in the ribs. At the same side of theplate but at the end thereof opposite the opening for the intake line33, a pipe 34 leads from the chamber of the plate to the two-way valve32 into which it opens opposite the main supply line 30.

As best shown in Fig. 2, the Valve member 32a of the two-Way valve canbe set by the'handle of action of the pressure fluid propelling blastsvdischarging from the jet openings 22. The pressure fluid to the jetopenings is rst brought from a source of supply through the main supplyline 3B and its valve Si to the two-way valve 32. 'Ifnere the pressurefluid is directed by the setting of the valve member 32a into the pipeline 33 g from which it flows into the chamber Ila of the distributorplate. Within this chamber the pressure fluid flows longitudinally backand forth through the smaller connecting chambers llc until it reachesthe outlet line 34 through which it flows back into thetwo-way valve 32on the other side of the valve member 32a which directs it into thesupply pipe 2l and thence to the chamber '26 of the manifold 25.

From the manifold the pressure fluid flows into the pipes 24 whichconduct the pressure fluid to the chambers of the distributor head 20.The valves 28 in the pipes 24 control the pressure of the blastsdischarging through the jet openings and may be regulated independentlyof one another to discharge propelling blasts of different forces.

Should the exposed portion of the chambered plate Il eventually crack orburn through, causing a flow of pressure fluid into the furnace, theflow of fluid .to the chambered plate can be cut off and the fluid feddirectly to the manifold by changing the setting of the valve member 32aso that it will cause the pressure fluid to pass directly from'the mainsupply line 38 to the manifold connection line 2l.V

Preferably, I contemplate utilizing saturated steam as the pressurefluid. The vsaturated 'steam passing through the chambered plate IlYwill absorb heat and serve to cool the plate; and; in effect, thechambered plate will'function somewhat as a super-heater for thesaturated steam tending to decrease the water content thereof and thusminimize so-called water-cutting of the jet openings 22.

I claim: Y

1. In a Stoker mechanism for a boiler furnace, a hollow distributorplate adapted to extend into the furnace, a distributor head havingpassages therethrough arranged to discharge fuel propelling blastsacross the upper surface of the distributor plate, a manifold having apressure fluid supply chamber, supply lines establishing communicationbetween said chamber and the passages in the distributor head,regulating valves in said supply lines adapted to control said blasts,and means for supplying pressure fluid into said hollow distributorplate and thence into the supply chamber of said manifold, said meansincluding a valve mechanism operable to out off the supply of pressurefluid to said hollow distributor plate and to divert said fluid directlyto said supply chamber of the manifold.

2. A Stoker mechanism for supplying fuel to a boiler furnace comprisinga distributor table located at the furnace end of said mechanism andbeing exposed to the heat of the furnace, said distributor table havinga fuel supporting top wall and means providing a chamber beneath saidtop wall, a jet head having a passage therethrough arranged to dischargea blast of fluid under pressure across the top wall of said distributorplate for projecting fuel over the furnace rebed, and means leading froma source of supply for supplying pressure fluid directly into saidchamber and thence into the passage in said jet head, said last namedmeans including valve mechanism operable to cut off the supply ofpressure fluid to said chamber and to divert such fluid from the sourceof supply to the passage in said jet head.

3. A Stoker mechanism for supplying fuel to a boiler furnace comprisinga distributor table located at the furnace end of said mechanism andbeing exposed to the heat of the furnace, said distributor table havinga fuel supporting top wall and means providing a chamber beneath saidtop wall, a jet head having a passage therethrough arranged to dischargea blast of fluid under pressure across the tcp wall of said distributortable for projecting fuel over the furnace frebed, a manifold having apressure fluid supply chamber, a supply line establishing communicationbetween the second named chamber and the passage in said jet head, aregulating valve in said supply line adapted to control the flow offluid from the second named chamber to the passage in said jet head, andmeans leading from a source of supply for supplying pressure fluiddirectly into the flrst named chamber and .thence into the second namedchamber, said means including valve mechanism operable to cut off thesupply of pressure fluid to the rst named charnber and divert such tothe secon-d named chamber.

EDWIN ARCHER TURNER.

